I’ve always used Al and Au in mine but I’m in a research institute and so I can’t speak for what people use in real cameras, but it does appear that Ag is somewhat used in wire bonding, so you can be right!

But every element is pure, so it doesn’t make a lot of sense.

Was this purity in the sense of “absence of impurities” or “absence of evil”? Because if it’s the latter I’m pretty sure I’ve met a few Si wafers with evil agendas.